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String Case Conversion method
<! DOCTYPE html>
<meta charset= "Utf-8" >
<title> Case Conversion </title>
<body>
<script type= "Text/javascript" >
var str= "HELLO World";
Console.log (Str.tolowercase ());//hello World
Console.log (Str.touppercase ());//hello World
</script>
</body>
String pattern matching method
<! DOCTYPE html>
<meta charset= "Utf-8" >
<title> string pattern matching </title>
<body>
<script type= "Text/javascript" >
/*
Match method: Accepts only one parameter, a regular expression specified by a string or RegExp object
Search method: Accepts only one parameter, a regular expression specified by a string or RegExp object
The search method returns the index of the first occurrence in a string, or 1 if there is no match.
*/
var str= "Cat,bat,sat,fat";
var pattern=/.at/;
var matches=str.match (pattern);
Console.log (matches.index);//0
Console.log (Matches[0]);//cat
Console.log (pattern.lastindex);//0
Lastindex represents the start of the search for the next occurrence of the character position, starting from 0
var pos=str.search (/at/);
Console.log (POS);//1 1 indicates where the at string first appears in the original string
</script>
</body>
Replace method
<! DOCTYPE html>
<meta charset= "Utf-8" >
<title>replace Methods </title>
<body>
<script type= "Text/javascript" >
var str= "Cat,bat,sat,fat";
var res=str.replace ("At", "one");//The first argument is a string, so only the first substring is replaced
Console.log (res);//cone,bat,sat,fat
var res1=str.replace (/at/g, "one");//The first argument is a regular expression, so all substrings are replaced
Console.log (res1);//cone,bone,sone,fone
</script>
</body>
Split method
<! DOCTYPE html>
<meta charset= "Utf-8" >
<title>split Methods </title>
<body>
<script type= "Text/javascript" >
/*
The Split method splits a string into a string array based on the specified character.
When the specified character is an empty string, the entire string is delimited
*/
var str= "Red,blue,green,yellow";
Console.log (Str.split (","));//["Red", "Blue", "green", "yellow"]
Console.log (Str.split (",", 2));//["Red", "blue"] the second parameter is used to limit the size of the array
Console.log (Str.split (/[^\,]+/));//[",", ",", ",", "," "]
The first and last entries are empty strings because the delimiter specified by the regular expression appears at the beginning of the substring, "red" and "yellow"
[^ ...] any character that is not in square brackets is a delimiter as long as it is not a comma
</script>
</body>
Localecompare method
<! DOCTYPE html>
<meta charset= "Utf-8" >
<title>localecompare Methods </title>
<body>
<script type= "Text/javascript" >
/*
This method is used to compare two strings
1. If the string should precede the string parameter in the alphabet, a negative number is returned
1. If the string equals the string argument, 0 is returned.
1. Returns a positive number if the string should be in the alphabet after the string argument
*/
var str= "Yellow";
Console.log (Str.localecompare ("Brick"));//1
Console.log (Str.localecompare ("yellow"));//0
Console.log (Str.localecompare ("Zoo"));//-1
</script>
</body>
JavaScript string Method (ii)
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